Don't process messages sent to dead routing ids.

chrome/browser/extensions/api/declarative_content/declarative_content_condition_tracker_test.cc

Index: chrome/browser/extensions/api/declarative_content/declarative_content_condition_tracker_test.cc
diff --git a/chrome/browser/extensions/api/declarative_content/declarative_content_condition_tracker_test.cc b/chrome/browser/extensions/api/declarative_content/declarative_content_condition_tracker_test.cc
index 9ad530d5cad29e7ff349991531dcd69d047906c2..811af350ee2ca9c9e1eda05cf4316f709198ccb2 100644
--- a/chrome/browser/extensions/api/declarative_content/declarative_content_condition_tracker_test.cc
+++ b/chrome/browser/extensions/api/declarative_content/declarative_content_condition_tracker_test.cc
@@ -28,9 +28,12 @@ DeclarativeContentConditionTrackerTest::
 
 scoped_ptr<content::WebContents>
 DeclarativeContentConditionTrackerTest::MakeTab() {
-  return make_scoped_ptr(content::WebContentsTester::CreateTestWebContents(
-      profile_.get(),
-      nullptr));
+  scoped_ptr<content::WebContents> tab(
+      content::WebContentsTester::CreateTestWebContents(profile_.get(),
+                                                        nullptr));
+  content::RenderFrameHostTester::For(tab->GetMainFrame())
+      ->InitializeRenderFrameIfNeeded();
+  return tab;
 }
 
 content::MockRenderProcessHost*